逆向调制空间光通信快速捕获对准特性

Fast acquiring and pointing characteristics of modulating retro-reflecting free space optical communication

相较于传统自由空间光通信(FSO)系统,逆向调制空间光通信(MRR FSO)系统可以有效减少捕获对准时间。介绍了MRR FSO的工作原理,分析了MRR FSO系统链路建立过程以及与FSO系统捕获对准的数学模型。仿真结果表明:MRR FSO系统链路建立过程减少了一个终端的扫描过程,从而大幅降低链路所需时间,且不确定范围越大,MRR FSO系统的优势越大;在典型参数下,MRR FSO系统链路建立时间可以提高2个数量级;通过合理控制光束发散角可以实现不同通信距离条件下不影响信号的接收功率和最大捕获时间,实现不同距离的快速捕获对准。

Compared with the traditional free space laser communication（FSO） system, the modulating retro-reflecting free space optical communication（MRR FSO） can effectively reduce the acquiring and pointing time. This paper introducs the principle of MRR FSO, and analyzs the link building process and mathematical model of traditional and MRR FSO. The simulation result shows that the process of link establishment in the MRR FSO overleaps the scanning process of one terminal, which greatly reduces the time required for the link, and the larger the uncertain area is, the greater the advantage is. Using representative parameters, the link building time of MRR FSO can be improved by 2 orders of magnitude. By reasonably controlling the divergence angle of the beam, it is possible to achieve a fast acquisition alignment with different distances without affecting the signal reception power and the maximum acquisition time under different communication distance conditions.